I wouldn't normally step into the historical politics of a nation to which I was not born, but I've often heard American citizens proclaim USA as a Christian Nation.
The document below seems to clearly deny that, and quite categorically I'd say.(I've ommited articles 1-10 here, but they can found by following the full article link below.)

Treaty of Peace and Friendship between the United States and the Bey and Subjects of Tripoli of BarbaryAuthored by American diplomat Joel Barlow in 1796, the following treaty was sent to the floor of the Senate, June 7, 1797, where it was read aloud in its entirety and unanimously approved. John Adams, having seen the treaty, signed it and proudly proclaimed it to the Nation.Annals of Congress, 5th Congress

Art. 11. As the Government of the United States of America is not, in any sense, founded on the Christian religion; as it has in itself no character of enmity against the laws, religion, or tranquillity, of Mussulmen; and, as the said States never entered into any war, or act of hostility against any Mahometan nation, it is declared by the parties, that no pretext arising from religious opinions, shall ever produce an interruption of the harmony existing between the two countries.

Seems as though Ye Olde U S of A
was always intended to be Atheist!
Gotta love them founding fathers
Makes you wonder if their true intent was a
United States for Atheists?

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